Interrupt generator and speech reproduction device incorporating same

Abstract: Apparatus for generating interrupt information includes an address generator (7) for generating specified address information for specifying desired information stored in a memory (4), a readout address generator (8) for generating readout address information of the desired information stored in the memory (4), and a comparator (9) for comparing the specified address information from the address generator (7) and the readout address information from the readout address generator (8) and for generating interrupt information in case of coincidence of the specified address information and the readout address information and supplying the interrupt information to a central processing unit (2). Since the interrupt data is supplied to the central processing unit (2) at the playback timing of desired data (e.g. desired sound source data), reproduction of the sound source data can be detected, so that it is unnecessary for the central processing unit to poll the address of the sound source data at all times and hence the load imposed on the central processing unit may be correspondingly decreased.

Description: This invention relates to sound information processing apparatus which may, be example, advantageously be employed in an electronic musical instrument or a television game device. The sound sources employed in general in an electronic musical instrument or a television game device may be roughly classified into analog sound sources, such as a voltage-controlled oscillator (VCO), a voltage-controlled amplifier (VCA), a voltage-controlled filter (VCF) etc., and digital sound sources, such as a programmable sound generator (PSG) or a zigzag readout type ROM. The above-mentioned sound source (sampler sound source) stores only sound source data of a pre-set pitch (interval) compressed by compression with, for example, non-linear quantization. Each sound source data is stored in two parts, that is in a formant portion (FR) and a one-period portion (LP) of plural repeated constant period waveforms following the formant portion, as shown in Fig.4. The formant portion is a signal waveform at the initial stage of sound production proper to each musical instrument, such as an operating sound produced from when a key of a keyboard is struck until a hammer hits the string in the case of a piano. During readout of the sound source data the formant portion is read out first and the one-period portion is read out a plurality of times. Since the above sound source data is compressed, and only the required portions, that is the above formant portion and the one-cycle repetitive portion, are extracted and stored, a large quantity of sound source data may be stored in a smaller storage area. As a general speech information processor for data processing of the sampler sound source, there has been proposed an audio processing unit (APU) 107 consisting of a digital signal processing unit (DSP) 101, a memory 102 and a central processing unit (CPU) 103, as shown in Fig.5 of the accompanying drawings. In Fig. 5, the APU 107 is shown connected to a host computer 104, provided in a customary personal computer, a digital electronic musical instrument or a TV game device. The host computer 104 includes a ROM cassette storing the above-mentioned sound source data, the control program etc. The control program stored in the ROM cassette is read out by the CPU 103 so as to be stored in a working memory (RAM) 103a therein. The CPU 103 causes the sound source data to be read out from the ROM cassette and transiently stored in the memory 102, based upon the above-mentioned control program. The CPU 103 also controls the DSP 101 responsive to control by the CPU 103. The DSP 101 causes the sound source data stored in the memory 102 to be read out under control by the CPU 103 and processes the sound source data thus read out with, for example, bit expansion or pitch conversion. The processed sound source data, outputted by the DSP 101, is fed by a D/A converter 105 and thereby converted into analog speech signals which are fed to a speaker unit 106. Thus an acoustic output corresponding to the speech sound data may be produced via the speaker unit 106. The speech information processor has the continuous playback function of continuously reproducing the sound source data after re-writing a portion of the sound source data, and the multi-loop playback function of repeatedly reproducing each of plural sound source data a pre-set number of times. If, with the continuous reproduction, the first sound source data and the second sound source data are stored in the memory 102 in succession, the CPU 103 controls the DSP 101 in order to reproduce the data sequentially from the first sound source data first. In the CPU 103 and the DSP 101, the access timing to the memory 102 is pre-set so that DSP 101 accesses the memory 102 twice and subsequently the CPU 103 accesses the memory once. The CPU 103 perpetually polls the end point of the first sound source. The CPU 103 controls the writing in the memory 102 so that, when the end point of the first sound source data is surpassed and the second sound source data starts to be reproduced, the first sound source data is rewritten to and replaced by the third sound source data at the access timing of the CPU 103. The CPU 103 also controls the writing in the memory 102 so that, when the end point of the second sound source data is surpassed and the third sound source data starts to be reproduced, the second sound source data is replaced by the fourth sound source data at the access timing of the CPU 103. Such control assures continuous reproduction of the sound source data. If, with the multi-loop playback function, the sound source data of the first formant portion, the sound source data of the first repetitive portion following the sound source data of the first formant portion, the sound source data of the second formant portion and the sound source data of the second repetitive portion following the sound source data of the second formant portion, are stored in succession in the memory 102, the CPU 103 causes the DSP 101 to reproduce the sound source data sequentially beginning from the sound source data of the first formant portion. The CPU 103 perpetually polls the end point of the sound source data of the first repetitive portion. When the end point of the first repetitive portion is detected, the CPU 103 increments a counter, not shown, while causing the DSP 101 to reproduce the sound source data of the first repetitive portion from the outset. Thus the CPU 103 causes the DSP 101 to continuously reproduce the sound source data of the first repetitive portion a plurality of number of times, while incrementing the counter and causing the DSP 101 to reproduce the sound source data of the second formant portion when the count value of the counter reaches a pre-set value. The CPU 103 perpetually polls the end point of the sound source data of the second repetitive portion. When the end point of the second repetitive portion is detected, the CPU 103 increments the counter, while causing the DSP 101 to reproduce the sound source data of the second repetitive portion from the outset. Thus the CPU 103 causes the DSP 101 to continuously reproduce the sound source data of the second repetitive portion a plurality of number of times, while incrementing the counter and causing the DSP 101 to reproduce the sound source data of the first formant portion when the count value of the counter reaches a pre-set value. Such control assures reproduction of the sound source data of the repetitive portion a pre-set number of times by way of multi-loop reproduction. The document US-A-4985914 discloses a voice storage/retrieval system with memory address generator successively with starting-point addresses. The present applicants have filed a related European Patent Application Publication No. EP-A-0 543 667, and a corresponding patent application (now pending) in USA. If, with the above-described speech information processor employing the APU 107, the sound source data is to be reproduced continuously, the CPU 103 needs to read out the end point of the first sound source data, the second sound source data and so forth frequently and to perpetually poll the end point of the sound source data. On the other hand, if the sound source data is to be reproduced by multi-loop reproduction, the CPU 103 similarly needs to read out the end point of the sound source data of the first repetitive portion, the sound source data of the second repetitive portion and so forth frequently and to perpetually poll the end point of the sound source data. Such frequent readout of the end point loads the CPU 103 excessively in case of the continuous reproduction or multi-loop reproduction. According to the invention there is provided apparatus for processing sound data information, the apparatus comprising: first processing means for receiving sound data information and control programs and for controlling a continuous playback operation and a multi-loop playback operation of said apparatus; a local memory for receiving and storing the sound data information from said first processing means; and second processing means for reading out the stored sound data information from said memory and for processing the read sound data information in a predetermined manner, said second processing means including address generating means for generating address information for the sound data information stored in said memory, interrupt address generating means responsive to an interrupt generating control signal supplied from said first processing means for generating interrupt address information, and comparator means for comparing the address information from said address generating means and the interrupt address information from said interrupt address generating means and, upon a corresponding match thereof, for generating an interrupt signal and for supplying said interrupt signal to said first processing means; wherein during said continuous playback operation, said first processing means upon receipt of the interrupt signal from said comparator means controls said memory such that the sound data information stored in said memory which corresponds to the sound data information already read out by the second processing means is rewritten with other sound data information and supplies said interrupt generating control signal to said interrupt address generating means so as to cause said interrupt address generating means to generate a new interrupt address corresponding to the rewritten other sound data information, and wherein during said multi-loop playback operation, said first processing means upon receipt of the interrupt signal from said comparator means (i) controls said second processing means such that at least a portion of the read sound data information is repeatedly read out a number of times from said memory, (ii) detects the number of times the at least a portion of the read sound data information is read out, and (iii) supplies said interrupt control signal to said interrupt address generating means (8) so as to cause said interrupt address generating means to generate new interrupt address information when the detected number of times the at least a portion of the read sound data information is read out is a pre-set number. In view of the above-depicted problems of the prior art, an embodiment of the invention described hereinbelow seeks to provide a speech information processor in which the load imposed on a CPU may be relieved in case of continuous reproduction or multi-loop reproduction. With the embodiment of the invention described hereinbelow, addressing means feeds specified address information for specifying desired information stored in memory means to comparator means. The readout address generating means also feeds readout address information of the desired information stored in the memory means to the comparator means. The comparator means compares the readout address information from the readout address generating means with the specified address information from the addressing means and, if the readout address information and the specified address information coincide with each other, the comparator means issues and transmits the interrupt information to, for example, a central processing unit (CPU). Thus, the interrupt information is outputted at the readout timing of the information stored in the address specified by the addressing means. Consequently, by setting the address specified by the addressing means at, for example, an end point of the desired information, it becomes possible for the CPU to detect the end point, based upon the interrupt information supplied thereto, without the necessity of perpetually polling the end point, thus correspondingly relieving the load imposed on the CPU. In the speech information processor embodying the invention and described hereinbelow, a CPU, acting as first execution means, writes speech information in memory means, while a digital signal processor (DSP), acting as second execution means, such as the second signal processor, reads out speech information written in the memory means, and processes the read-out speech information in a pre-set manner before outputting the speech information. During the continuous reproduction in which the sound source data is partially rewritten after reproduction, the first speech information and the second speech information are consecutively written in the memory means. The CPU then controls addressing means for outputting specified address information indicating a leading address of, for example, second speech information stored in the memory means. This specified address information is fed to the comparator means. The DSP controls the addressing means for outputting the readout address information so that the speech information will be sequentially reproduced beginning from the first speech information. The comparator means compares the specified address information and the readout address information and, if these two coincide with each other, transmits the interrupt information to the CPU. Thus, the interrupt information is fed to the CPU at the playback timing of the leading address of the second speech information. When fed with the interrupt information from the comparator means, the CPU controls the writing in the memory means so that, of the speech information stored in the memory means, the first speech information already read out by the DSP is rewritten to third speech information. The CPU also controls the addressing means for outputting the specified address information indicating the leading address of the third speech information. Next, the interrupt information is supplied to the CPU at the timing of reproduction of the leading address of the third speech information. When fed with the interrupt information, the CPU controls the writing in the memory means for rewriting the second speech information read out completely by the DSP to fourth speech information, while controlling the addressing means for outputting the specified address information indicating the leading address of the fourth speech information. By repetition of the above-described control operations, the speech information may be continuously reproduced using a smaller storage area of the memory means. The interrupt information is outputted at the readout timing of the next speech information. Thus, it becomes possible for the CPU to detect the end point, based upon the interrupt information supplied thereto, without the necessity of perpetually polling the end point, thus correspondingly relieving the load imposed on the CPU. With the speech information processor embodying the invention, the CPU, as first execution means, writes the speech information in memory means, while the digital signal processor (DSP), as the second execution means, such as the second signal processor, reads out the speech information written in the memory means, and processes the read-out speech information in a pre-set manner before outputting the speech information, as described previously. During the multi-loop reproduction, in which each of plural sound source data is repeatedly reproduced a number of times, the speech information of the first formant portion, the speech information of the first repetitive portion following the first formant portion, the speech information of the second formant portion and the speech information of the second repetitive portion following the second formant portion, are consecutively written in the memory means. The CPU then controls the addressing means for outputting the specified address information indicating the leading address, for example, of the speech information of the first repetitive portion stored in the memory means. This specified address information is fed to the comparator means. The DSP, on the other hand, controls the address generating mans for outputting the readout address information so that the speech information will be sequentially reproduced beginning from the speech information of the first formant portion. The readout address information is supplied to the comparator means. The comparator means compares the specified address information to the readout address information and, if the two coincide with each other, outputs the interrupt information to the CPU. Thus the interrupt information is supplied in this case at the playback timing of the speech information of the leading address of the speech information of the first repetitive portion. When fed with the interrupt information from the comparator means, the CPU controls the DSP for reading out the speech information of the first repetitive portion. Thus the interrupt information is fed to the CPU each time the speech information of the leading address of the first repetitive portion of the speech information is reproduced. The CPU detects the number of times the interrupt information is supplied thereto in order to detect the number of times of repeated reading of the speech information of the first repetitive portion. The CPU controls the addressing means so that, when the number of times of repeated reading reaches a pre-set value, that is when the interrupt information is supplied a pre-set number of times, the specified address information indicating the leading address, for example, of the speech information of the second repetitive portion to be repeatedly reproduced next time will be outputted. In this manner, after reproducing the speech information of the second formant portion, the interrupt information is supplied to the CPU at the timing of reproduction of the speech information of the second repetitive portion. When fed with the interrupt information, the CPU controls the DSP for repeatedly reproducing the speech information of the second repetitive portion in the same manner as described above. The CPU detects the number of times of delivery of the interrupt information for detecting the number of times the speech information of the second repetitive portion is read out repeatedly. When the number of times of repeated readout reaches a pre-set value, the CPU controls the addressing means for outputting the specified address information indicating the leading address, for example, of the speech information of the first repetitive portion to be repeatedly reproduced next. The above-mentioned multi-loop reproduction may be carried out by such repetition of the control operations. The interrupt information is outputted at the readout timing of the speech information of the repetitive portion read out repeatedly a plural number of times. Thus it becomes possible for the CPU to detect the end point, based upon the interrupt information supplied thereto, without the necessity of perpetually polling the end point, thus relieving the load on the CPU correspondingly. Thus, with interrupt information generating apparatus so descibed hereinbelow, the interrupt information can be outputted at the readout timing of the information of the specified address on the memory means. Consequently, should the interrupt information generator be provided in an equipment having the function of continuous reproduction by partially rewriting the information following the end of reproduction, and the multi-loop playback function of repeatedly reproducing each of plural sound source data a pre-set number of times, the interrupt information maybe outputted at the playback timing of the desired address information. Thus it is unnecessary for the CPU taking charge of control of the continuous reproduction and the multi-loop reproduction to poll the address of the desired information at all times, thereby relieving the load on the CPU correspondingly. With the below-described interrupt information generating apparatus, the interrupt information can be outputted at the readout timing of the information of the specified address on the memory means. Thus, should the speech information be continuously reproduced by partially writing the speech information after the end of reproduction, the interrupt information can be outputted at the reproduction timing of the desired address information. Thus it is unnecessary for the first execution means taking charge of control of the continuous reproduction to poll the address of the desired information at all times for correspondingly relieving the load on the first execution means. With the below-described interrupt information generating apparatus, the interrupt information can be outputted at the readout timing of the information of the specified address on the memory means. Thus, should the speech information be reproduced by multi-loop reproduction by repeatedly reproducing each plural sound source information data a pre-set number of times, the interrupt information can be outputted at the reproduction timing of the speech or sound source information of the desired address. Thus it is unnecessary for the first execution means taking charge of control of the multi-loop reproduction to poll the address of the desired information at all times for correspondingly relieving the load on the first execution means. Thus the speech information processor embodying the invention contributes to extension of the service life of the CPU or the first execution means. The invention will now be further described, by way of illustrative and non-limiting example, with reference to the accompanying drawings, in which: Fig.1 is a block diagram showing an embodiment of the present invention in which an interrupt information processor and a speech information processor are provided in a television game device having a continuous playback function and a multi-loop function. Figs.2a and 2b are diagrammatic views showing a local memory for illustrating the continuous playback function of the television game device shown in Fig.1. Fig.3 is a diagrammatic view of the local memory for illustrating the multi-loop function of the television game device shown in Fig.1. Fig.4 is a graph showing sound source data of the non-interval portion and sound source data of the interval portion, stored separated from each other in a sampler sound source. Fig.5 is a block diagram showing a previously proposed speech information processor. Referring to the drawings, preferred embodiments of speech information processor according to the invention will be explained in detail. A speech information processor embodying the invention may be applied to a television game machine as shown in Fig.l. With the television game machine, a central processing unit (CPU) 2, as first executing means, is connected to a host computer system 1 in which there is provided a sound source ROM having sound source data, control programs for carrying out the television game etc., previously stored therein. The CPU 2 is connected to a main memory 3 for storing the control programs etc. read out from the sound source ROM and to a local memory 4 for storing the sound source data read out from the sound source ROM. The local memory 4 is connected to a digital signal processor (DSP) 5, as second executing means, whichin turn is connected to a D/A converter 10. The D/A converter 10 is connected to a speaker unit 11. In the sound source ROM, 16-bit sound source data of various musical instruments, such as piano, saxophone or cymbals, are stored in a 4-bit compressed form. The sound source data having a non-interval (non-pitch) portion, such as a formant portion FR shown in Fig.4, such as sound source data of a piano, are stored divided into a non-interval portion and an interval portion (a repetitive portion LP shown in Fig.4). The local memory 4 has a storage capacity of, for example, 64 kbytes, with a memory access time being 330 ns for each memory access operation. The programs for the CPU 2 are stored in the local memory 4 in addition to the sound source data. Two execution cycles of the DSP 5 are carried out for each execution cycle of the CPU 2, and the local memory 4 is time-divisionally employed for these execution cycles. The DSP 5 is made up of an address generator 7 as readout address generating means for supplying readout addresses for reading out sound source data stored in the local memory 4 to the local memory 4, an interrupt address register 8 as address designating means for outputting a specified address for designating a leading address, for example, of desired sound source data of the local memory 4, and a comparator 9 as comparator means for comparing the readout address and the specified address and for supplying interrupt data to the CPU 2 in case of coincidence of the two addresses. The address generator 7, interrupt address register 8 and the comparator 9, constituting the DSP 5, make up an interrupt information generator. The operation of the above-described television game device of the present embodiment is as follows: When the game is started, the CPU 2 reads out sound source data and the control programs from the sound source ROM of the host computer 1 during the execution cycle of the CPU 2, while controlling the main memory 3 for storing the control programs and controlling the local memory 4 for storing the sound source data. As the game progresses, the CPU 2 reads out the control programs from the main memory 3, and controls the DSP 5 based upon the control programs. The DSP 5 reads out the sound source data from the local memory 4 during the execution cycle of the CPU 2 under control by the CPU 2. The data processing unit 6 processes the read-out 4-bit sound source data, for example, by data expansion for expanding the data to 16 bits and by echoing for adding echo to the data. The processed data is supplied to the D/A processor 10 converts the sound source data into analog signals to generate speech signals which are outputted to the speaker unit 11. Thus an acoustic signal corresponding to the speech signals can be produced by the speaker unit 11. By employing the sole local memory 4 time-divisionally by the CPU 2 and the DSP 5, it becomes possible to improve the exploiting efficiency of the local memory 4 and to realize the inexpensive local memory 4 with the small storage capacity, thereby lowering the production cost. During continuous playback for continuously reproducing the sound source data by partially rewriting the sound source data after the end of reproduction, the CPU 2 causes the first sound source data and the second sound source data read out from the sound source ROM to be respectively written in the first storage area 4A and in the second storage area 4B of the local memory 4, as shown in Fig.2a. The CPU 2 causes the interrupt address register 8 to output the specified address data indicating the leading address, for example, of the second sound source data stored in the local memory 4. The specified address data indicating the leading address of the second sound source data outputted from the interrupt address register 8 is fed to the comparator 9. The DSP 5 causes the address generating circuit 7 to output the readout address data for sequentially reproducing the sound source data, from the first sound source data first, via the local memory address register 7a of the address generator 7. This readout address data is fed to the comparator 9. The comparator 9 compares the specified address data and the readout address data to each other and, incase of coincidence of the two data, outputs an interrupt data to the CPU 2. That is, in such case, the interrupt data is fed to the CPU 2 at the playback timing of the sound source data of the leading address of the second sound source data, as shown by arrow in Fig.2a. When fed with the interrupt data from the comparator 9, the CPU 2 controls the writing in the local memory 4 for rewriting the first sound source data already read out by the DSP 5 to the third sound source data, as shown in Fig.2b. The first and third sound source data are among the sound source data stored in the local memory 4. Also the CPU 2 controls the interrupt address register 8 for outputting the specified address data indicating the leading address of the third sound source data, as shown by arrow in Fig.2b. Thus the interrupt data is fed to the CPU 2 at the playback timing of the sound source data of the leading address of the third sound source data. When fed with the interrupt data, the CPU 2 controls the local memory 4 for rewriting the second sound source data already read out by the DSP 5 to the fourth sound source data, while controlling the interrupt address register 8 for outputting the specified address indicating the leading address of the fourth sound source data. By repeating the above control operations, the sound source data may be continuously reproduced using the smaller storage area of the local memory 4. As mentioned above, the interrupt data is outputted at the readout timing of the next sound source data. Thus, by the above interrupt data, it is possible for the CPU 2 to detect the end point of the desired sound source data without the necessity of perpetually polling the end of the sound source data. Thus the load imposed on the CPU 2 is correspondingly relieved to assure a longer service life of the CPU 2. During the multi-loop reproduction when each of plural sound source data is repeatedly reproduced a number of times, the CPU 2 controls the local memory 4 for reading out the sound source data of the first formant portion, sound source data of the first repetitive portion succeeding to the first formant portion, sound source data of the second formant portion and the sound source data of the second repetitive portion succeeding to the second formant portion, from the sound source ROM, and for writing these sound source data in first to fourth storage areas 4a to 4d of the local memory 4, as shown in Fig.3. The CPU 2 then controls the interrupt address register 8 for outputting the specified address data indicating the leading address, for example, of the sound source data of the first repetitive portion written in the second storage area 4b. The specified address data are fed to the comparator 9. The DSP 5 controls the address generating circuit 7 for outputting readout address data so that sound source data are sequentially outputted beginning with the sound source data of the first formant portion stored in the first storage area 4a. This readout address data is fed to the comparator 9. The comparator 9 compares the specified address data to the readout address data an, in case of coincidence of the two address data, outputs interrupt data to the CPU 2. That is, the interrupt data is supplied in this case to the CPU 2 at the playback timing of the leading address of the sound source data of the first repetitive portion. When fed with the interrupt data from the comparator 9, the CPU 2 controls the DSP 5 for repeatedly reading out the speech data of the first repetitive portion stored in the second storage area 4b. Thus the interrupt data is supplied to the CPU 2 each time the leading address of the sound source data of the first repetitive portion is reproduced. The CPU 2 detects the number of times the interrupt data is supplied thereto in order to detect the number of times the speech data of the first repetitive portion is repeatedly read out. The CPU 2 controls the interrupt address register 8 so that, when the number of times of repeated readout reaches a pre-set number of times, that is when the interrupt data is supplied a pre-set number of times, the specified address data indicating the leading address, for example, of the sound source data of the second repetitive portion to be repeatedly read out next time, is outputted. This routes the interrupt data to the CPU 2 at the timing of reproduction of the sound source data of the second repetitive portion stored in the fourth storage area 4c after reproduction of the sound source data of the second formant portion stored in the third storage area 4c. When fed with the interrupt data, the CPU 2 controls the DSP 5 for repeatedly reading out the sound source data of the second repetitive portion in the same manner as above. The CPU 2 detects the number of times the interrupt data is supplied thereto for detecting the number of times of repetitive readout of the sound source data of the second repetitive portion. The CPU 2 controls the interrupt address register 8 so that, when the number of times of repeated readout reaches a pre-set value, a specified address data indicating the leading address, for example, of the sound source data of the frost repetitive portion, is outputted. The above-mentioned multi-loop reproduction may be achieved by repetition of the above control operations. The interrupt data is outputted at the readout timing of the sound source data of the repetitive portion read out in a repeated manner. Thus the load imposed on the CPU 2 is correspondingly relieved to assure a longer service life of the CPU 2. In the above description, the interrupt information generator is applied to a television game device. However, the interrupt information generator may be applied to other equipment handling digital data, such as a digital picture processor. Also, a speech information processor embodying the invention may be applied to equipment handling sound source data, such as electronic musical instruments, in addition to the television game device described above. Ultimately, in the above description, the storage capacity of the local memory 4 is 64 kbytes, and the memory access time is 330 ns. However, these numerical values are merely illustrative, and the interrupt information generator and the speech information processor embodying the invention may be modified in desired manner without departing from the scope of the invention.

Claims: Apparatus for processing sound data information, the apparatus comprising: first processing means (2) for receiving sound data information and control programs and for controlling a continuous playback operation and a multi-loop playback operation of said apparatus; a local memory (4) for receiving and storing the sound data information from said first processing means (2); and second processing means (5) for reading out the stored sound data information from said memory (4) and for processing the read sound data information in a predetermined manner, said second processing means (5) including address generating means (7) for generating address information for the sound data information stored in said memory, interrupt address generating means (8) responsive to an interrupt generating control signal supplied from said first processing means (2) for generating interrupt address information, and comparator means (9) for comparing the address information from said address generating means (7) and the interrupt address information from said interrupt address generating means (8) and, upon a corresponding match thereof, for generating an interrupt signal and for supplying said interrupt signal to said first processing means; wherein during said continuous playback operation, said first processing means (2) upon receipt of the interrupt signal from said comparator means (9) controls said memory (4) such that the sound data information stored in said memory which corresponds to the sound data information already read out by the second processing means (5) is rewritten with other sound data information and supplies said interrupt generating control signal to said interrupt address generating means (8) so as to cause said interrupt address generating means to generate a new interrupt address corresponding to the rewritten other sound data information, and wherein during said multi-loop playback operation, said first processing means (2) upon receipt of the interrupt signal from said comparator means (9) (i) controls said second processing means such that at least a portion of the read sound data information is repeatedly read out a number of times from said memory, (ii) detects the number of times the at least a portion of the read sound data information is read out, and (iii) supplies said interrupt control signal to said interrupt address generating means (8) so as to cause said interrupt address generating means to generate new interrupt address information when the detected number of times the at least a portion of the read sound data information is read out is a pre-set number. Apparatus as claimed in claim 1, comprising a host computer (1) connected to said first processing means (2) for supplying said sound data information and said control programs to said first processing means, and wherein said first processing means (2) controls the sound data information written in said memory (4) via said host computer (1). Apparatus as claimed in claim 2, wherein sound data information of N bits is stored in said memory (4) after being compressed to M bits. Apparatus as claimed in claim 3, wherein said second processing means (5) executes two execution cycles per execution cycle of said first processing means (2), and wherein said local memory (4) is utilized on a time-divisional basis. Apparatus as claimed in claim 4, comprising a D/A converter (10) and a speaker (11) connected to said second processing means (5) for reproducing and outputting the sound data information.

Inventors: FURUHASHI MAKOTO, SUZUOKI MASAKAZU, FURUHASHI, MAKOTO, SUZUOKI, MASAKAZU, FURUHASHI, MAKOTO, C/O INTELLECTUAL PROPERTY DIV., SUZUOKI, MASAKAZU, C/O INTELLECTUAL PROPERTY DIV.
Applicants: SONY CORP, SONY CORPORATION
Application year: 1994
Main classification: G06F3
IPC codes: G06F3, G10L13, G10H7